Koblenz - Upright F&G Micro-Lined disposable paper bags 45-0728-1Filtration efficiency: 99.70 at 5.0 microns particle size. Disposable vacuum cleaner bags are convenient because after you use them, you simply throw them away. These particular disposable bags are micro-lined. Micro-lined vacuum bags are beneficial for allergy and asthma sufferers because they have a filtration efficiency of 99.7% at 5.0 microns particle size. Three bags come in this pack. They are meant to be used with Koblenz commercial upright vacuum cleaners ( Z models ). The Koblenz 45-0728-1 includes three micro-lined vacuum cleaner bags.